/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
Find FBX meshes that match Unreal skeletal mesh according to the bone of mesh
the root bone that bind to the FBX skeletal meshes
FbxNode * FindFBXMeshesByBone ( const [FName](API\Runtime\Core\UObject\FName) & RootBoneName, bool bExpandLOD, [TArray](API\Runtime\Core\Containers\TArray)< FbxNode * > & OutFBXMeshNodeArray )